Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d59f89cb3ac99b…

MALICIOUS

PDF

79.5 KB Created: 2021-03-18 19:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a14c70156d401ce92b86f503ef49595 SHA-1: 90a94a5fa20a3d761fe91ce0408b15160670c706 SHA-256: 20d59f89cb3ac99bfa9bc222d621bd12e5c2ecf60e52f02cbec5d64692ab7d53
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of the attack chain. The document body, though heavily obfuscated, contains text related to health benefits, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the presence of external URIs and the high confidence detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=para+que+sirve+el+turmeric+y+jengibre
    • http://nulagumuxim.iblogger.org/67921258269.pdf
    • http://zovolexune.sportsontheweb.net/retawelufeseweju.pdf
    • http://jesiwufap.iblogger.org/super_mario_maker_2_pc_free.pdf
    • http://zojapudugu.22web.org/15600138227.pdf
    • http://tenakororor.iblogger.org/livetaketotonid.pdf
    • http://xarapover.mygamesonline.org/zevugupitekididopufedure.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pizivurapab/follow_up_boss_email_templates.pdf
    • https://s3.amazonaws.com/dumupa/telecharger_cambly_apk.pdf
    • http://deketinak.rf.gd/introduction_myself_in_english_format.pdf
    • https://s3.amazonaws.com/verirejon/cagr_formel_excel_2010_deutsch.pdf
    • https://s3.amazonaws.com/sowewazulejewi/vocab_level_g_unit_2_synonyms_answers.pdf
    • http://wulekugigewipo.epizy.com/blouse_designs_photos_2018.pdf
    • http://dafesofuxub.rf.gd/nintendo_3ds_sd_card_game.pdf
    • http://dojiseb.epizy.com/bose_s1_pro_specs.pdf
    • http://ginokiximoz.rf.gd/international_journal_of_business_communication_impact_factor.pdf
    • https://s3.amazonaws.com/wefemabeni/omnisphere_2_audio_demos.pdf
    • https://s3.amazonaws.com/vavapekadoliti/mujolofosujitogarew.pdf
    • http://silugat.epizy.com/adverb_phrase_and_adjective_phrase.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53c.bin
38f1c58d9cdb2c75f86254af8af600b80444028288ff41bdaa07d64f3927f830		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 5624 bytes
font_01_sfnt_off00010861.bin
9a91661008bf8158da8d063cd209877a1eb4e5dee318074ab6f7c2afef8cb1a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 11692 bytes

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